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JP2005110248A - Packet-based high-quality high-bandwidth digital content protection - Google Patents

Packet-based high-quality high-bandwidth digital content protection Download PDF

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JP2005110248A
JP2005110248A JP2004277145A JP2004277145A JP2005110248A JP 2005110248 A JP2005110248 A JP 2005110248A JP 2004277145 A JP2004277145 A JP 2004277145A JP 2004277145 A JP2004277145 A JP 2004277145A JP 2005110248 A JP2005110248 A JP 2005110248A
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data packet
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packet
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encryption
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JP2005110248A5 (en
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Osamu Kobayashi
小林　修
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Genesis Microchip Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption
    • H04N21/44055—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption by partially decrypting, e.g. decrypting a video stream that has been partially encrypted
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
    • H04L63/0471—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload applying encryption by an intermediary, e.g. receiving clear information at the intermediary and encrypting the received information at the intermediary before forwarding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
    • H04N21/23476—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption by partially encrypting, e.g. encrypting the ending portion of a movie
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/254—Management at additional data server, e.g. shopping server, rights management server
    • H04N21/2541—Rights Management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/4104—Peripherals receiving signals from specially adapted client devices
    • H04N21/4122—Peripherals receiving signals from specially adapted client devices additional display device, e.g. video projector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4367—Establishing a secure communication between the client and a peripheral device or smart card
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/835—Generation of protective data, e.g. certificates
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2463/00—Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00
    • H04L2463/101—Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00 applying security measures for digital rights management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
    • H04L63/1441—Countermeasures against malicious traffic
    • H04L63/1475—Passive attacks, e.g. eavesdropping or listening without modification of the traffic monitored

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  • Engineering & Computer Science (AREA)
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  • Multimedia (AREA)
  • Computer Security & Cryptography (AREA)
  • Databases & Information Systems (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Television Signal Processing For Recording (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

【課題】 パケット転送モードで動作する、リンク上でのＨＤＣＰのような既存の高品位コピー保護プロトコルとの互換性がある高品位コピー保護をサポートする方法、或いは伝送媒体を提供すること。
【解決手段】 以下のステップを含むパケットベースの高帯域幅コピー保護方法が説明される。ソースデバイスにおいて複数のデータパケットを形成するステップ、暗号値のセットに基づいてデータパケットのうちの選択されたものを暗号化するステップ、ソースデバイスから該ソースデバイスに接続されたシンクデバイスへ暗号化されたデータパケットを伝送するステップ、暗号値に部分的に基づいて暗号化されたデータパケットを復号化するステップ、復号化されたデータパケットにシンクデバイスによりアクセスするステップ。
【選択図】 図１PROBLEM TO BE SOLVED: To provide a method or a transmission medium for supporting high quality copy protection which is compatible with an existing high quality copy protection protocol such as HDCP on a link which operates in a packet transfer mode.
A packet-based high bandwidth copy protection method including the following steps is described. Forming a plurality of data packets at a source device; encrypting a selected one of the data packets based on a set of encryption values; encrypted from the source device to a sink device connected to the source device Transmitting the received data packet; decrypting the encrypted data packet based in part on the encryption value; and accessing the decrypted data packet by the sink device.
[Selection] Figure 1

Description

関連出願の説明Explanation of related applications

本特許出願は、米国特許法第１１９条（ｅ）項に基づき、出典を明記することによりその開示内容全体をあらゆる目的で本願明細書の一部とする２００３年９月２６日提出のコバヤシによる仮特許出願第６０／５０６，１９３号（代理人整理番号ＧＥＮＳＰ０４７Ｐ）「パケットデータストリームにおける高品位コピー保護の提供」に基づく優先権を得る。   This patent application is filed by Kobayashi, filed on Sep. 26, 2003, which is hereby incorporated by reference in its entirety for all purposes under 119 (e) US Patent Act. Provisional priority is obtained based on provisional patent application No. 60 / 506,193 (Attorney Docket No. GENSP047P) “Providing High Quality Copy Protection in Packet Data Streams”.

本発明はディスプレイデバイスに関する。詳しくは、本発明は、パケット伝送環境においてオーディオ／ビデオデータの堅牢な暗号化を提供できる方法及び装置を説明する。   The present invention relates to display devices. Specifically, the present invention describes a method and apparatus that can provide robust encryption of audio / video data in a packet transmission environment.

占有デジタルコンテンツの保護は、特に具体的には高品位（ＨＤ）高帯域幅の用途において、重要な考慮事項となっている。ＨＤ高帯域幅の用途にとって特に重要なことに、コンテンツ保護は、デジタル化コンテンツの所有者が占有コンテンツの無許可使用及びコピーから保護される状態を保証する。カリフォルニア州サンタクララのＩｎｔｅｌ Ｃｏｒｐｏｒａｔｉｏｎが開発した、一般にＨＤＣＰと呼ばれる普及度の高い高帯域幅デジタルコンテンツ保護方式は、広く実施されてきた。現在の構成のように、この特定のＨＤＣＰプロトコルは、デジタルビジュアルインタフェース（ＤＶＩ）及び高品位マルチメディアインタフェース（ＨＤＭＩ）に基づく環境での使用のために限定的に設計されている。   Proprietary digital content protection is an important consideration, particularly in high definition (HD) high bandwidth applications. Of particular importance for HD high bandwidth applications, content protection ensures that digitized content owners are protected from unauthorized use and copying of proprietary content. A popular high-bandwidth digital content protection scheme, commonly referred to as HDCP, developed by Intel Corporation of Santa Clara, California has been widely implemented. Like the current configuration, this particular HDCP protocol is designed specifically for use in environments based on Digital Visual Interface (DVI) and High Definition Multimedia Interface (HDMI).

一般に、ＨＤＣＰは、ＰＣ、ＤＶＤプレイヤ、又はセットトップボックス等のビデオソース又はトランスミッタと、モニタ、テレビ、又はプロジェクタ等のデジタルディスプレイ又はレシーバとの間でのデジタルコンテンツの伝送を暗号化する。これにより、ＨＤＣＰは、デジタルコンテンツのコピー又は記録を防止し、これにより、伝送中のコンテンツの完全性を保護するように設計される。例えば、説明するＨＤＣＰプロトコルで求められるように、認証段階中、レシーバは、秘密値の計算を通じてトランシーバが検証した認証鍵を知っていることを実証した後でなければ、コンテンツを提供されない。更に、データの盗聴及び盗用を防止するために、トランスミッタ及びレシーバは、伝送の全体を通じて常にチェックされる共有秘密値を生成する。認証が確立されると、トランスミッタは、データを暗号化し、復号化のためにレシーバに送信する。   In general, HDCP encrypts the transmission of digital content between a video source or transmitter, such as a PC, DVD player, or set-top box, and a digital display or receiver, such as a monitor, television, or projector. Thereby, HDCP is designed to prevent copying or recording of digital content, thereby protecting the integrity of the content being transmitted. For example, as required by the described HDCP protocol, during the authentication phase, the receiver is not provided with content until after verifying that the transceiver knows the authentication key verified by the secret value calculation. Furthermore, to prevent wiretapping and theft of data, the transmitter and receiver generate a shared secret value that is always checked throughout the transmission. Once authentication is established, the transmitter encrypts the data and sends it to the receiver for decryption.

ＤＶＩ規格の現在の実施では、１０ビット伝送プロトコルに基づく定義済みの文字セットを使用する必要がある。例えば、現在の構成のように、（利用可能な１０２４のうち）４６０文字のみがレシーバによってデータのために使用され、一方、四文字がＨＳＹＮＣ及びＶＳＹＮＣといった明示的な制御信号として使用される。この仕組みにおいて、レシーバがデータを表す所定の文字の一つを受領及び認識した時は常に、受領されたものは、データイネーブル信号（ＤＥ）をアクティブであるものとして黙示的に定義し、これにより、受領済みデータが真のデータであることを示す。しかしながら、四つの制御文字の一つがレシーバに受領された時は常に、データイネーブル（ＤＥ）が非アクティブであるという黙示的な仮定がなされる。   Current implementations of the DVI standard require the use of a predefined character set based on a 10-bit transmission protocol. For example, as in the current configuration, only 460 characters (out of 1024 available) are used for data by the receiver, while four characters are used as explicit control signals such as HSYNC and VSYNC. In this scheme, whenever the receiver receives and recognizes one of the predetermined characters representing the data, the received one implicitly defines the data enable signal (DE) as active, thereby , Indicates that the received data is true data. However, whenever one of the four control characters is received by the receiver, an implicit assumption is made that the data enable (DE) is inactive.

ＨＤＣＰプロトコルは、ＤＥの状態、Ｈsync、Ｖsync、及びＣＮＴＬ３と呼ばれるその他の制御信号を使用して、ステートマシンを進める。ＤＥ、Ｈsync、及びＶsync信号は、「ストリーミング」方式で伝送されるラスタビデオに関連するタイミング信号である。ストリーミング転送において、ピクセルデータは、ピクセルレートで伝送され、ブランキング期間とデータ期間との比率は、維持される。パケット転送の場合、こうしたタイミング信号は、存在しなくてもよい。パケットストリームにおいては、ピクセルデータのみを転送してよいが、タイミング情報は、異なる形で通信される。したがって、必要なものは、パケット転送モードで動作する、リンク上でのＨＤＣＰのような既存の高品位コピー保護プロトコルとの互換性がある高品位コピー保護をサポートする方法、或いは伝送媒体である。 The HDCP protocol uses the DE state, H sync , V sync , and other control signals called CNTL 3 to advance the state machine. The DE, H sync and V sync signals are timing signals associated with raster video transmitted in a “streaming” manner. In streaming transfer, pixel data is transmitted at a pixel rate, and the ratio between the blanking period and the data period is maintained. In the case of packet transfer, such timing signals may not be present. In the packet stream, only pixel data may be transferred, but timing information is communicated differently. Therefore, what is needed is a method or transmission medium that supports high quality copy protection that is compatible with existing high quality copy protection protocols such as HDCP over the link, operating in packet transfer mode.

したがって、ＨＤＣＰ等、既存の高品位コピー保護プロトコルとの後方互換性がある、高品位コピー保護をサポートするパケットベース・デジタル伝送媒体及びプロトコルが提供される。   Accordingly, packet-based digital transmission media and protocols that support high quality copy protection that are backward compatible with existing high quality copy protection protocols such as HDCP are provided.

本発明の一実施形態では、パケットベースの高帯域幅コピー保護方法が説明され、以下の動作を含む。ソースデバイスにおいて複数のデータパケットを形成すること、暗号値のセットに基づいてデータパケットを暗号化すること、ソースデバイスから、ソースデバイスに接続されたシンクデバイスへ、暗号化されたデータパケットを伝送すること、暗号値に部分的に基づいて暗号化されたデータパケットを復号化すること、シンクデバイスによって復号化データパケットにアクセスすること。   In one embodiment of the present invention, a packet-based high bandwidth copy protection method is described and includes the following operations. Forming a plurality of data packets at the source device, encrypting the data packet based on a set of encryption values, and transmitting the encrypted data packet from the source device to a sink device connected to the source device Decrypting the encrypted data packet based in part on the encrypted value, and accessing the decrypted data packet by the sink device.

別の実施形態では、データストリームに対してパケットベースの高帯域幅コピー保護を提供するシステムが開示され、複数のデータパケットを提供するように構成されたソースユニットと、ソースユニットからデータパケットを受領するように構成された、ソースユニットに接続されたシンクユニットと、ソースユニットからシンクユニットに送信されるデータパケットを暗号化するように構成された、ソースユニットに接続された暗号化ユニットと、暗号化されたデータパケットを復号化するように構成された、シンクユニットに接続された復号化ユニットと、適切なデータパケットを暗号化及び復号化するのに使用される暗号／復号値のセットを提供するように構成された暗号／復号値発生器と、を含む。   In another embodiment, a system for providing packet-based high bandwidth copy protection for a data stream is disclosed, wherein a source unit configured to provide a plurality of data packets and receiving a data packet from the source unit A sink unit connected to the source unit, and an encryption unit connected to the source unit configured to encrypt data packets transmitted from the source unit to the sink unit; and A decryption unit connected to a sink unit configured to decrypt the encrypted data packet and a set of encryption / decryption values used to encrypt and decrypt the appropriate data packet And an encryption / decryption value generator configured to:

更に別の実施形態では、パケットベースの高帯域幅コピー保護を提供するコンピュータプログラム製品が開示され、ソースデバイスにおいて複数のデータパケットを形成するコンピュータコードと、暗号値のセットに基づいてデータパケットを暗号化するコンピュータコードと、ソースデバイスから、ソースデバイスに接続されたシンクデバイスへ、暗号化されたデータパケットを伝送するコンピュータコードと、暗号値に部分的に基づいて暗号化されたデータパケットを復号化するコンピュータコードと、シンクデバイスによって復号化データパケットにアクセスするコンピュータコードと、コンピュータコードを格納するコンピュータ可読媒体とを含む。   In yet another embodiment, a computer program product that provides packet-based high-bandwidth copy protection is disclosed that encrypts a data packet based on a computer code that forms multiple data packets at a source device and a set of cryptographic values. Computer code, computer code for transmitting encrypted data packets from the source device to the sink device connected to the source device, and decrypting the encrypted data packets based in part on the encrypted value Computer code for accessing the decoded data packet by the sink device, and a computer readable medium for storing the computer code.

次に、添付図面に例示した本発明の特定の実施形態を詳細に参照する。本発明については特定の実施形態に関連させて説明するが、説明する実施形態に本発明を限定するものではないことは理解されよう。逆に、付記する特許請求の範囲により画定される本発明の趣旨及び範囲内に含まれ得る代替例、変形例、及び等価物は、本発明に包含される。   Reference will now be made in detail to a specific embodiment of the invention an example of which is illustrated in the accompanying drawings. While the invention will be described in conjunction with the specific embodiment, it will be understood that it is not intended to limit the invention to the described embodiment. On the contrary, alternatives, modifications and equivalents that may be included within the spirit and scope of the invention as defined by the appended claims are encompassed by the invention.

現在の実施のように、ＨＤＣＰは、ディスプレイデバイスが保護コンテンツの受領をライセンスされていることを検証するために、安全なチャネルを確立し、確立後、保護コンテンツの「盗聴」を防止するために、ホスト側でデータを暗号化し、ディスプレイデバイスで復号化する。加えて、無許可デバイス又は構成デバイスを識別するために、ＨＤＣＰは、認証及び鍵の交換と、コンテンツ暗号化と、デバイスの更新可能性とに依存する。   As in current implementations, HDCP establishes a secure channel to verify that the display device is licensed to receive protected content and, after establishment, to prevent “spotting” of protected content Data is encrypted on the host side and decrypted on the display device. In addition, HDCP relies on authentication and key exchange, content encryption, and device updatability to identify unauthorized or constituent devices.

更に具体的には、ＨＤＣＰは、ビデオソースとデジタルディスプレイ（レシーバ）との間での伝送を暗号化することで、デジタルビデオインタフェース（ＤＶＩ）環境内の著作権のあるデジタル娯楽コンテンツを保護する。ビデオソースは、ＰＣ、セットトップボックス、ＤＶＤプレイヤ、及びその他にしてよく、デジタルディスプレイは、液晶ディスプレイ（ＬＣＤ）、テレビ、プラズマパネル、又はプロジェクタにしてよく、許可された全てのデバイスには、一意の秘密デバイス鍵のセットが与えられる。認証プロセス中、レシーバは、保護コンテンツが送信される前に、多数の秘密デバイス鍵を知っていることを実証する必要がある。レシーバが鍵の確認をすると、両デバイス（センダ及びレシーバ）は、盗聴者がコンテンツを盗むのを防止することを目的とした共有秘密値を生成する。認証後、コンテンツは、暗号化され、レシーバに送信され、次にレシーバがコンテンツを復号化する。   More specifically, HDCP protects copyrighted digital entertainment content within a digital video interface (DVI) environment by encrypting transmissions between the video source and the digital display (receiver). The video source may be a PC, set-top box, DVD player, and others, and the digital display may be a liquid crystal display (LCD), television, plasma panel, or projector, and is unique to all authorized devices. A set of secret device keys is given. During the authentication process, the receiver needs to demonstrate that it knows a number of secret device keys before the protected content is transmitted. When the receiver verifies the key, both devices (sender and receiver) generate a shared secret value intended to prevent an eavesdropper from stealing the content. After authentication, the content is encrypted and sent to the receiver, which then decrypts the content.

認証は、ディスプレイデバイスが保護コンテンツの受領を許可（又はライセンス）されていることを検証する暗号プロセスである。許可されたホスト及びディスプレイデバイスは、両方とも、４０個の５６ビット秘密デバイス鍵の配列と、対応する４０ビットバイナリ鍵選択ベクトル（ＫＳＶ）とによって構成される秘密鍵のセットの知識を有している。ホストは、鍵選択ベクトルＡＫＳＶを含む開始メッセージと６４ビット値Ａｎとを送信することで、認証を開始する。ディスプレイデバイスは、鍵選択ベクトルＢＫＳＶを含む応答メッセージを送信することで応答する。ホストは、受領したＫＳＶが無効になっていないことを確認する。この時、二つのデバイスは、共有値を計算可能であり、両デバイスが有効な鍵セットを有する場合、共有値は等しくなる。認証が確立しているため、この共有値は、保護コンテンツの暗号化及び復号化で使用されることになる。   Authentication is a cryptographic process that verifies that the display device is authorized (or licensed) to receive protected content. Both authorized host and display devices have knowledge of a set of secret keys composed of an array of 40 56-bit secret device keys and a corresponding 40-bit binary key selection vector (KSV). Yes. The host starts authentication by transmitting a start message including the key selection vector AKSV and a 64-bit value An. The display device responds by sending a response message containing the key selection vector BKSV. The host confirms that the received KSV is not invalidated. At this time, the two devices can calculate the shared value, and if both devices have a valid key set, the shared value will be equal. Since authentication is established, this shared value is used for encryption and decryption of the protected content.

再認証は、およそ二秒に一度の割合で継続され、リンクの継続的な安全性を確認する。いかなる時でも、例えば、ディスプレイデバイスの接続解除及び／又は不正な記録デバイスの接続によって、共有値の同一性が失われた場合、ホストは、ＤＶＩリンクが認証されていないものとみなし、保護コンテンツの伝送を終了する。   Re-authentication continues at a rate of approximately once every two seconds, confirming the continued security of the link. If at any time the identity of the shared value is lost, for example by disconnecting the display device and / or connecting an unauthorized recording device, the host considers the DVI link unauthenticated and End transmission.

伝送コンテンツの使用可能な無許可コピーが作成されるのを防止するために、コンテンツは、ソースデバイスで暗号化される。暗号化は、コンテンツを転換させる、暗号（cipher）と呼ばれるアルゴリズムの適用である。コンテンツを復元するために、ディスプレイデバイスは、正しい復号鍵の知識によって、コンテンツを復号化する。ＨＤＣＰ暗号は、ハイブリッド・ブロック／ストリーム暗号である。ブロック暗号は、認証プロトコル中に動作する。コンテンツの暗号化及び復号化のために、ＨＤＣＰは、ストリーム暗号を使用し、ストリーム暗号では、暗号化は、ＨＤＣＰ暗号によって生成されたデータストリームを、ビット毎の排他的論理和演算を通じて、伝送コンテンツと組み合わせることで達成される。これにより、コンテンツは、ピクセル毎に保護される。復号化せずにディスプレイデバイス上に表示された暗号化コンテンツは、ランダムノイズに見え、識別可能なコンテンツは存在しない。上記の通り、現在利用可能なＨＤＣＰプロトコルは、ＤＶＩタイプのコネクタを使用して実施する必要がある。   In order to prevent the creation of usable unauthorized copies of the transmitted content, the content is encrypted at the source device. Encryption is the application of an algorithm called cipher that transforms content. To restore the content, the display device decrypts the content with knowledge of the correct decryption key. The HDCP cipher is a hybrid block / stream cipher. The block cipher operates during the authentication protocol. For content encryption and decryption, HDCP uses a stream cipher, and in the stream cipher, the encryption is performed by transmitting a data stream generated by the HDCP cipher through a bitwise exclusive OR operation. Achieved by combining with. Thereby, the content is protected for each pixel. Encrypted content displayed on the display device without decryption appears to be random noise and there is no identifiable content. As described above, currently available HDCP protocols need to be implemented using DVI type connectors.

本発明は、既存の高品位コピー保護プロトコルとの後方互換性がある高品位コピー保護をサポートする堅牢なデジタル著作権保護プロトコルを提供する、パケット伝送媒体での使用に適した高品位高帯域幅コピー保護プロトコルを提供する。本発明の一実施形態において、本発明のＨＤＣＰプロトコルは、ソースデバイスにおいて複数のデータパケットを形成することと、暗号値のセットに基づいてデータパケットの選択されたものを暗号化することと、ソースデバイスから、ソースデバイスに接続されたシンクデバイスへ、暗号化されたデータパケットを伝送することと、暗号値に部分的に基づいて暗号化されたデータパケットを復号化することと、シンクデバイスによって復号化データパケットにアクセスすることとを含む、パケットベースの高帯域幅コピー保護方法として実施される。   The present invention provides a high-quality, high-bandwidth suitable for use in packet transmission media that provides a robust digital copyright protection protocol that supports high-quality copy protection that is backward compatible with existing high-quality copy protection protocols Provides a copy protection protocol. In one embodiment of the present invention, the HDCP protocol of the present invention includes forming a plurality of data packets at a source device, encrypting a selected one of the data packets based on a set of cryptographic values, Transmit encrypted data packets from the device to the sink device connected to the source device, decrypt the encrypted data packets based in part on the encrypted value, and decrypt by the sink device Implemented as a packet-based high-bandwidth copy protection method, including accessing an encrypted data packet.

特に最適なパケット伝送システムについて、本発明の任意の実施形態で使用するのに適したクロスプラットフォームのパケットデジタルビデオディスプレイインタフェース１００の一般化表現を図示している図１を参照して説明する。インタフェース１００は、物理リンク１０６（パイプとも呼ばれる）を経由して、トランスミッタ１０２をレシーバ１０４に接続する。説明する実施形態では、多数のデータストリーム１０８乃至１１２がトランスミッタ１０２に受領され、トランスミッタ１０２は、必要であれば、それぞれを対応する数のデータパケット１１４にパケット化する。こうしたデータパケットは、その後、対応するデータストリームの形態に変換され、それぞれのデータストリームは、関連する仮想パイプ１１６乃至１２０を経由してレシーバ１０４に渡される。データストリーム１０８乃至１１２は、ビデオ、グラフィック、オーディオ、及びその他といった、任意の数の形態にできることに留意されたい。   A particularly optimal packet transmission system is described with reference to FIG. 1, which illustrates a generalized representation of a cross-platform packet digital video display interface 100 suitable for use in any embodiment of the present invention. The interface 100 connects the transmitter 102 to the receiver 104 via a physical link 106 (also called a pipe). In the described embodiment, multiple data streams 108-112 are received by transmitter 102, and transmitter 102 packetizes each into a corresponding number of data packets 114, if necessary. These data packets are then converted into the corresponding data stream form, and each data stream is passed to the receiver 104 via an associated virtual pipe 116-120. Note that the data streams 108-112 can be in any number of forms, such as video, graphics, audio, and others.

通常、ソースがビデオソースである時、データストリーム１０８乃至１１２は、コンポジットビデオ、シリアルデジタル、パラレルデジタル、ＲＧＢ、又は家庭用デジタルビデオといった、任意の数及びタイプの周知の形式を有する可能性がある様々なビデオ信号を含む。例えば、アナログテレビ、スチールカメラ、アナログＶＣＲ、ＤＶＤプレイヤ、ビデオカメラ、レーザディスクプレイヤ、ＴＶチューナ、セットトップボックス（及び衛星ＤＳＳ又はケーブル信号）、及びその他といった何らかの形態のアナログビデオソースをソース１０２が含む場合、ビデオ信号はアナログビデオ信号にできる。ソース１０２は、更に、例えば、デジタルテレビ（ＤＴＶ）、デジタルスチールカメラ、及びその他といったデジタル画像ソースを含むことができる。デジタルビデオ信号は、ＳＭＰＴＥ ２７４Ｍ−１９９５（解像度１９２０×１０８０、プログレッシブ又はインタレーススキャン）、ＳＭＰＴＥ ２９６Ｍ−１９９７（解像度１２８０×７２０、プログレッシブスキャン）、及び標準の４８０プログレッシブスキャンビデオといった任意の数及びタイプの周知のデジタル形式にできる。   Typically, when the source is a video source, the data streams 108-112 may have any number and type of well-known formats such as composite video, serial digital, parallel digital, RGB, or home digital video. Includes various video signals. For example, source 102 includes some form of analog video source such as analog television, still camera, analog VCR, DVD player, video camera, laser disc player, TV tuner, set top box (and satellite DSS or cable signal), and others. In this case, the video signal can be an analog video signal. Sources 102 may further include digital image sources such as, for example, digital television (DTV), digital still cameras, and others. The digital video signal may be any number and type of SMPTE 274M-1995 (resolution 1920 × 1080, progressive or interlaced scan), SMPTE 296M-1997 (resolution 1280 × 720, progressive scan), and standard 480 progressive scan video. Can be in a well-known digital format.

ソース１０２がアナログ画像信号を提供する場合、アナログ−デジタルコンバータ（Ａ／Ｄ）は、アナログ電圧又は電流信号を別個の一連のデジタルエンコードされた数（信号）に変換し、このプロセスにおいて、デジタル処理に相応しい適切なデジタル画像データワードが形成される。広範なＡ／Ｄコンバータのいずれかを使用できる。一例として、その他のＡ／Ｄコンバータは、例えば、Ｐｈｉｌｉｐｓ、Ｔｅｘａｓ Ｉｎｓｔｒｕｍｅｎｔ、Ａｎａｌｏｇ Ｄｅｖｉｃｅ、Ｂｒｏｏｋｔｒｅｅ、その他が製造したものを含む。   If the source 102 provides an analog image signal, an analog-to-digital converter (A / D) converts the analog voltage or current signal into a separate series of digitally encoded numbers (signals), in this process digital processing Appropriate digital image data words suitable for the above are formed. Any of a wide range of A / D converters can be used. As an example, other A / D converters include, for example, those manufactured by Philips, Texas Instrument, Analog Device, Brooktree, and others.

例えば、データストリーム１１０がアナログタイプの信号である場合、トランスミッタ１０２に含まれる又は接続されたアナログ−デジタルコンバータ（図示なし）は、アナログデータをデジタル化し、その後、デジタル化データストリーム１１０を多数のデータパケット１１４にパケット化するパケタイザがパケット化を行い、それぞれのデータパケット１１４は、仮想リンク１１６を経由して、レシーバ１０４に伝送されることになる。レシーバ１０４は、次に、データパケット１１４を再び適切に組み合わせてオリジナルの形式にすることで、データストリーム１１０を再構成する。こうしたデータストリームが、最終的に暗号化され、一組のコピー保護データストリームが形成される。   For example, if the data stream 110 is an analog type signal, an analog-to-digital converter (not shown) included in or connected to the transmitter 102 digitizes the analog data and then converts the digitized data stream 110 to multiple data. The packetizer packetized into packets 114 packetizes, and each data packet 114 is transmitted to the receiver 104 via the virtual link 116. The receiver 104 then reconstructs the data stream 110 by properly combining the data packets 114 again into the original format. These data streams are finally encrypted to form a set of copy protected data streams.

図２は、図１に関して説明したシステム１００で使用するのに適したオーディオ／ビデオコンテンツを暗号化する暗号化システム２００を図示している。図２に図示したように、ビデオソース２０２は、データストリーム１１０及び１１２のような多数のデータストリームを提供するように構成される。多数のデータストリームを利用することで、システム２００は、例えば、多数のビデオ形式のいずれかと同時に一致する状態で、ビデオデータを伝送することができる。例えば、データストリーム１１０は、１０２４×７６８、６０Ｈｚに一致するビデオデータの形態となり、一方、データストリーム１１２は、６４０×４８０、７５Ｈｚに一致するビデオデータの形態となり、以下も同様となる。レシーバ２０４（モニタ等）が適切な形式でビデオを再構築するために、データストリームは、加えて、適切なビデオデータ関連属性データを含み、ビデオデータ関連属性データは、適切な形式でビデオを再構築するためにレシーバによって使用される。   FIG. 2 illustrates an encryption system 200 that encrypts audio / video content suitable for use in the system 100 described with respect to FIG. As illustrated in FIG. 2, the video source 202 is configured to provide multiple data streams, such as data streams 110 and 112. By utilizing multiple data streams, the system 200 can transmit video data, for example, in a state that matches simultaneously with any of multiple video formats. For example, the data stream 110 is in the form of video data that matches 1024 × 768, 60 Hz, while the data stream 112 is in the form of video data that matches 640 × 480, 75 Hz, and so on. In order for the receiver 204 (such as a monitor) to reconstruct the video in the proper format, the data stream additionally includes the appropriate video data related attribute data, and the video data related attribute data reconstructs the video in the appropriate format. Used by the receiver to build.

したがって、ビデオソース２０２は、多数のバッファ２０６を含み、バッファ２０６のそれぞれは、ビデオデータストリームの関連する一本をバッファするのに使用される。それぞれのバッファは、次に、パケタイザ２１０への伝送のためにデータストリームの特定の一本を選択するのに使用されるマルチプレクサ２０８に接続される。パケタイザ２１０は、パケットＩＤを組み込み、随意的にエラー補正を実行し、タイムスタンプと、レシーバ４０４によるビデオラスタの正確な再構築にとって重要又は必要であると考えられる任意の属性とを加えることで、入射データストリームを解析し、関連する数のデータパケットにする。暗号化制御ジェネレータユニット２１２は、少なくとも、Ｈsyncと、Ｖsyncと、暗号化されたデータパケット（及び反対に暗号化されていないデータパケット）にフラグを立てるために使用される特定の制御文字ＣＮＴＬ３とのような信号を運ぶ制御パケットを挿入することに基づいて、それぞれのデータパケットに適切な暗号化アルゴリズムを適用する。 Accordingly, the video source 202 includes a number of buffers 206, each of which is used to buffer an associated piece of the video data stream. Each buffer is then connected to a multiplexer 208 that is used to select a particular one of the data streams for transmission to the packetizer 210. The packetizer 210 incorporates the packet ID, optionally performs error correction, and adds a timestamp and any attributes that may be important or necessary for the accurate reconstruction of the video raster by the receiver 404, The incident data stream is parsed into an associated number of data packets. The encryption control generator unit 212 has at least H sync , V sync, and a specific control character CNTL3 used to flag encrypted data packets (and vice versa). Appropriate encryption algorithms are applied to each data packet based on inserting control packets carrying signals such as.

本発明の実施形態によれば、（特定の例がデータストリーム３００として図３に図示された）結果として生じた暗号化データストリーム２１４は、多数のデータパケットの形態となる。データストリーム３００は、場合に応じて暗号化された（或いは暗号化されていない）ビデオデータパケットを示すために使用される多数の制御パケット３０２を含む。各ビデオパケットは、ビデオデータパケット３０６に関連する上記の属性データを一部として含む、関連するヘッダ３０４を有する。例えば、図３に図示したケースにおいて、データストリーム３００は、ビデオソース２０２とレシーバ２０４との間のトラフィックが一定のリンク環境に一致するようにデータストリーム３００に連結された、データストリーム１１０及びデータストリーム１２０のためのデータパケットを含む。   According to an embodiment of the present invention, the resulting encrypted data stream 214 (a specific example is illustrated in FIG. 3 as data stream 300) is in the form of a number of data packets. The data stream 300 includes a number of control packets 302 that are used to indicate video data packets that are encrypted (or unencrypted) as the case may be. Each video packet has an associated header 304 that includes as part of the above attribute data associated with the video data packet 306. For example, in the case illustrated in FIG. 3, the data stream 300 is concatenated to the data stream 300 such that the traffic between the video source 202 and the receiver 204 matches a certain link environment. Data packet for 120.

説明する実施形態において、データストリーム３００には時間領域多重化が施されており、データストリーム１００に関連するデータパケットは、データストリーム１１２に関連するものより長い持続時間を有することに留意されたい。こうしたケースでは、レシーバ２０４内の時間基準回復（ＴＢＲ）ユニット２１６が、必要に応じて、メインリンクデータパケットに埋め込まれたタイムスタンプを使用して、ストリームのオリジナルのネイティブレートを再生する。再び図２を参照すると、レシーバ４０４では、デシリアライザユニット２１８が、デコーダユニット２２０及びデパケタイザ２２２への入力を提供する暗号化データストリーム３００を受領する。デコーダ２２０は、制御パケットをデコードし、したがって、Ｈsyncと、Ｖsyncと、以前暗号化のために使用され、復号化エンジン２２８へ提供された特定の制御文字ＣＮＴＬ３とを供給する。 Note that in the described embodiment, the data stream 300 is time domain multiplexed and the data packets associated with the data stream 100 have a longer duration than those associated with the data stream 112. In such a case, a time base recovery (TBR) unit 216 in the receiver 204 regenerates the original native rate of the stream, if necessary, using a time stamp embedded in the main link data packet. Referring back to FIG. 2, at the receiver 404, the deserializer unit 218 receives an encrypted data stream 300 that provides input to the decoder unit 220 and depacketizer 222. The decoder 220 decodes the control packet and thus provides H sync , V sync, and the specific control character CNTL3 previously used for encryption and provided to the decryption engine 228.

図４は、本発明を実施するのに利用されるシステム４００を例示している。コンピュータシステム４００は、本発明を実施可能なグラフィックスシステムの例に過ぎない。システム４００は、中央処理装置（ＣＰＵ）４１０と、ランダムアクセスメモリ（ＲＡＭ）４２０と、読み出し専用メモリ（ＲＯＭ）４２５と、一つ以上の周辺機器４３０と、グラフィックスコントローラ４６０と、一次記憶デバイス４４０及び４５０と、デジタルディスプレイユニット４７０とを含む。ＣＰＵ４１０は、更に、トラックボール、マウス、キーボード、マイクロフォン、タッチセンシティブディスプレイ、トランスデューサカードリーダ、磁気又は紙テープリーダ、タブレット、スタイラス、音声又は手書認識器、或いは、当然ながら、他のコンピュータ等、その他の広く知られた入力デバイスといったデバイスを一部として含んでもよい一つ以上の入出力デバイス４９０に接続される。グラフィックスコントローラ４６０は、アナログ画像データと対応する基準信号とを生成し、両方をデジタルディスプレイユニット４７０に提供する。アナログ画像データは、例えば、ＣＰＵ４１０又は外部エンコード（図示なし）から受領したピクセルデータに基づいて生成できる。一実施形態において、アナログ画像データは、ＲＧＢ形式で提供され、基準信号は、この技術で広く知られたＶSYNC及びＨSYNC信号を含む。しかしながら、本発明は、その他の形式のアナログ画像、データ、及び／又は基準信号により実施することも可能であると理解されたい。例えば、アナログ画像データは、対応する時間基準信号を更に備えるビデオ信号データを含むことができる。 FIG. 4 illustrates a system 400 that may be utilized to implement the present invention. Computer system 400 is only an example of a graphics system in which the present invention can be implemented. The system 400 includes a central processing unit (CPU) 410, a random access memory (RAM) 420, a read only memory (ROM) 425, one or more peripherals 430, a graphics controller 460, and a primary storage device 440. And 450 and a digital display unit 470. The CPU 410 may also be a trackball, mouse, keyboard, microphone, touch sensitive display, transducer card reader, magnetic or paper tape reader, tablet, stylus, voice or handwriting recognizer, or, of course, other computers, etc. Connected to one or more input / output devices 490, which may include devices such as well-known input devices. The graphics controller 460 generates analog image data and corresponding reference signals and provides both to the digital display unit 470. The analog image data can be generated based on pixel data received from, for example, the CPU 410 or an external encoding (not shown). In one embodiment, the analog image data is provided in RGB format and the reference signal includes V SYNC and H SYNC signals that are well known in the art. However, it should be understood that the present invention may be implemented with other types of analog images, data, and / or reference signals. For example, the analog image data can include video signal data that further comprises a corresponding time reference signal.

以上、本発明の少数の実施形態を説明してきたが、本発明は、本発明の趣旨又は範囲から逸脱することなく、他の多数の特定の形態で実施し得ることは理解されたい。この説明は、限定的ではなく例示的なものと見做されるべきであり、本発明は、本明細書で述べた詳細に限定されず、付記する請求項の範囲内、及び等価物の全範囲内で、変形し得る。   Although a few embodiments of the present invention have been described above, it should be understood that the present invention can be embodied in many other specific forms without departing from the spirit or scope of the present invention. This description is to be regarded as illustrative instead of limiting, and the present invention is not limited to the details described herein, but within the scope of the appended claims and all equivalents. It can be deformed within the range.

本発明について、好適な実施形態の観点から説明してきたが、本発明の範囲内に含まれる変形例、置換例、及び等価物が存在する。また、本発明のプロセス及び装置の両方を実現する多数の代替方法が存在することにも留意されたい。したがって、本発明は、本発明の本来の趣旨及び範囲内に入るこうした全ての変形例、置換例、及び等価物を含むと解釈されるべきである。   While this invention has been described in terms of a preferred embodiment, there are variations, permutations, and equivalents that fall within the scope of this invention. It should also be noted that there are many alternative ways of implementing both the process and apparatus of the present invention. Accordingly, the present invention should be construed as including all such modifications, substitutions, and equivalents that fall within the true spirit and scope of the present invention.

本発明の任意の実施形態で使用するのに適したクロスプラットフォームのパケット・デジタルビデオディスプレイ・インタフェースの一般化表現を示す図FIG. 3 illustrates a generalized representation of a cross-platform packet digital video display interface suitable for use with any embodiment of the present invention. 図１に関して説明したシステムで使用するのに適したオーディオ／ビデオコンテンツを暗号化する暗号化システムを示す図1 illustrates an encryption system for encrypting audio / video content suitable for use in the system described with respect to FIG. 本発明の実施形態による代表的な暗号化データストリームを示す図FIG. 4 illustrates an exemplary encrypted data stream according to an embodiment of the present invention. 本発明を実施するのに利用されるシステムを例示する図FIG. 3 illustrates a system utilized to implement the present invention.

Claims (16)

パケットベースの高帯域幅コピー保護方法であって、
ソースデバイスにおいて複数のデータパケットを形成するステップと、
暗号値のセットに基づいて前記データパケットを暗号化するステップと、
前記ソースデバイスから、該ソースデバイスに接続されたシンクデバイスへ、前記暗号化されたデータパケットを伝送するステップと、
前記暗号値に部分的に基づいて前記暗号化されたデータパケットを復号化するステップと、
前記シンクデバイスにより、前記復号化されたデータパケットにアクセスするステップと、
を備える方法。 A packet-based high bandwidth copy protection method comprising:
Forming a plurality of data packets at a source device;
Encrypting the data packet based on a set of cryptographic values;
Transmitting the encrypted data packet from the source device to a sink device connected to the source device;
Decrypting the encrypted data packet based in part on the encryption value;
Accessing the decrypted data packet by the sink device;
A method comprising: 請求項１記載の方法であって、
前記ソースデバイスがビデオソースであり、
前記シンクデバイスがビデオディスプレイであり、
前記複数のデータパケットが、いくつかのオーディオデータパケットと、いくつかのビデオデータパケットとを含む、方法。 The method of claim 1, comprising:
The source device is a video source;
The sink device is a video display;
The method wherein the plurality of data packets includes a number of audio data packets and a number of video data packets. 暗号化／復号化制御信号が、Ｖｓｙｎｃと、Ｈｓｙｎｃと、ＣＮＴＬ３とを含む、請求項２記載の方法。   The method of claim 2, wherein the encryption / decryption control signal comprises Vsync, Hsync, and CNTL3. 前記データパケットのそれぞれが、特定の制御パケットに関連づけられている、請求項３記載の方法。   The method of claim 3, wherein each of the data packets is associated with a particular control packet. 前記ＣＮＴＬ３がアクティブである場合に、対応する前記データパケットが暗号化され、逆も同様である、請求項４記載の方法。   5. The method of claim 4, wherein when the CNTL3 is active, the corresponding data packet is encrypted and vice versa. パケットベースシステムにおいて高帯域幅コピー保護を提供するシステムであって、
複数のデータパケットを提供するように構成されたソースユニットと、
前記ソースユニットに接続され、前記ソースユニットから前記データパケットを受領するように構成されたシンクユニットと、
前記ソースユニットに接続され、前記ソースユニットから前記シンクユニットに送信される前記データパケットのうち選択されたものを暗号化するように構成された暗号化ユニットと、
前記シンクユニットに接続され、前記暗号化されたデータパケットを復号化するように構成された復号化ユニットと、
適切な前記データパケットを暗号化及び復号化するのに使用される暗号／復号値のセットを提供するように構成された暗号／復号値発生器と、
を備えるシステム。 A system that provides high bandwidth copy protection in a packet-based system,
A source unit configured to provide a plurality of data packets;
A sink unit connected to the source unit and configured to receive the data packet from the source unit;
An encryption unit connected to the source unit and configured to encrypt selected ones of the data packets transmitted from the source unit to the sink unit;
A decryption unit connected to the sink unit and configured to decrypt the encrypted data packet;
An encryption / decryption value generator configured to provide a set of encryption / decryption values used to encrypt and decrypt the appropriate data packet;
A system comprising: 前記ソースユニットが、オーディオタイプのデータパケットと、ビデオタイプのデータパケットと、の少なくとも一方を提供するように構成されたオーディオ／ビデオユニットである、請求項６記載のシステム。   The system of claim 6, wherein the source unit is an audio / video unit configured to provide at least one of an audio type data packet and a video type data packet. 前記シンクユニットが、前記ビデオデータパケットのうちの処理されたものを表示するように構成されたディスプレイユニットである、請求項７記載のシステム。   The system of claim 7, wherein the sink unit is a display unit configured to display processed ones of the video data packets. 前記ディスプレイユニットが、前記オーディオデータパケットのうちの処理されたものに基づいて、オーディオ信号を伝送するように構成された複数のスピーカを含む、請求項８記載のシステム。   The system of claim 8, wherein the display unit includes a plurality of speakers configured to transmit an audio signal based on a processed one of the audio data packets. 暗号化／復号化制御信号のセットが、前記ビデオデータパケットに対応するＶｓｙｎｃと、Ｈｓｙｎｃとを含む、請求項９記載のシステム。     The system of claim 9, wherein the set of encryption / decryption control signals includes Vsync and Hsync corresponding to the video data packet. 前記暗号化／復号化制御信号のセットが、暗号化された前記データパケットにフラグを立てるためのＣＮＴＬ３を更に含む、請求項１０記載のシステム。   The system of claim 10, wherein the set of encryption / decryption control signals further comprises CNTL3 for flagging the encrypted data packet. パケットベースの高帯域幅コピー保護を提供するコンピュータプログラム製品であって、
ソースデバイスにおいて複数のデータパケットを形成するためのコンピュータコードと、
暗号値のセットに基づいて前記データパケットを暗号化するためのコンピュータコードと、
前記ソースデバイスから、該ソースデバイスに接続されたシンクデバイスへ、前記暗号化されたデータパケットを伝送するためのコンピュータコードと、
前記暗号値に部分的に基づいて前記暗号化されたデータパケットを復号化するためのコンピュータコードと、
前記シンクデバイスにより前記復号化されたデータパケットにアクセスするためのコンピュータコードと、
前記コンピュータコードを格納するコンピュータ読み取り可能な媒体と、
を備えるコンピュータプログラム製品。 A computer program product that provides packet-based high-bandwidth copy protection,
Computer code for forming a plurality of data packets at a source device;
Computer code for encrypting the data packet based on a set of cryptographic values;
Computer code for transmitting the encrypted data packet from the source device to a sink device connected to the source device;
Computer code for decrypting the encrypted data packet based in part on the encryption value;
Computer code for accessing the decrypted data packet by the sink device;
A computer readable medium for storing the computer code;
A computer program product comprising: 請求項１２記載のコンピュータプログラム製品であって、
前記ソースデバイスがビデオソースであり、
前記シンクデバイスがビデオディスプレイであり、
前記複数のデータパケットが、いくつかのオーディオデータパケットと、いくつかのビデオデータパケットとを含む、コンピュータプログラム製品。 A computer program product according to claim 12, comprising:
The source device is a video source;
The sink device is a video display;
A computer program product, wherein the plurality of data packets includes a number of audio data packets and a number of video data packets. 前記暗号化制御信号が、Ｖｓｙｎｃと、Ｈｓｙｎｃと、ＣＮＴＬ３とを含む、請求項１３記載のコンピュータプログラム製品。   The computer program product of claim 13, wherein the encryption control signal includes Vsync, Hsync, and CNTL3. 前記データパケットのそれぞれが、特定の制御値ＣＮＴＬ３に関連づけられている、請求項１４記載のコンピュータプログラム製品。   The computer program product of claim 14, wherein each of the data packets is associated with a specific control value CNTL3. 前記ＣＮＴＬ３がアクティブである場合に、対応するデータパケットが暗号化され、逆も同様である、請求項１５記載のコンピュータプログラム製品。   16. The computer program product of claim 15, wherein when the CNTL3 is active, the corresponding data packet is encrypted and vice versa.
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US8385544B2 (en) 2013-02-26
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US20050069130A1 (en) 2005-03-31
US7634090B2 (en) 2009-12-15

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